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© 2006 American Physical Society (APS). This is the accepted version of the following article: Nagy, I. & Puska, Martti J. & Zabala, N. 2006. Numerical study of bound states for point charges shielded by the response of a homogeneous two-dimensional electron gas. Physical Review B. Volume 74, Issue 11. 115411/1-5. ISSN 1550-235X (electronic). DOI: 10.1103/physrevb.74.115411, which has been published in final form at http://journals.aps.org/prb/abstract/10.1103/PhysRevB.74.115411.